\usepackage[tikz]{bclogo}
\colorlet{colbackbclogo}{black!5!white}
\newenvironment{info}[1][\infoTitle]
	{\vspace{0.3cm}\begin{bclogo}[logo=\bcinfo, couleurBarre=infoBorder, noborder=true, couleur=colbackbclogo, arrondi=0.1]{~#1}}
	{\end{bclogo}}

\newenvironment{warn}[1][\warnTitle]
	{\vspace{0.3cm}\begin{bclogo}[logo=\bcattention, couleurBarre=warnBorder, noborder=true, couleur=colbackbclogo, arrondi=0.1]{~#1}}
	{\end{bclogo}}

\newenvironment{alert}[1][\alertTitle]
	{\vspace{0.3cm}\begin{bclogo}[logo=\bcdanger, couleurBarre=alertBorder, noborder=true, couleur=colbackbclogo, arrondi=0.1]{~#1}}
	{\end{bclogo}}

\newenvironment{tip}[1][\tipTitle]
	{\vspace{0.3cm}\begin{bclogo}[logo=\bclampe, couleurBarre=tipBorder, noborder=true, couleur=colbackbclogo, arrondi=0.1]{~#1}}
	{\end{bclogo}}

\newenvironment{help}[1][\helpTitle]
	{\vspace{0.3cm}\begin{bclogo}[logo=\bcnote, couleurBarre=helpBorder, noborder=true, couleur=colbackbclogo, arrondi=0.1]{~#1}}
	{\end{bclogo}}

\usepackage{changepage}
\newenvironment{solu}[1][2em]
	{\begin{adjustwidth}{#1}{0.5em}}
	{\end{adjustwidth}}